package cn.bugstack.springframework.beans.factory.support;
// 抽象类定义模板方法(AbstractBeanFactory)
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.BeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;

// AbstractBeanFactory 首先继承了 DefaultSingletonBeanRegistry，也就具备了使用
//单例注册类方法。
public abstract class AbstractBeanFactory extends DefaultSingletonBeanRegistry implements BeanFactory {
    @Override
    public Object getBean(String name) throws BeansException {
        return doGetBean(name,null);

    }
    @Override
    public  Object getBean(String name, Object... args) throws BeansException {
        return doGetBean(name, args);
    }

    @Override
    public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
        return (T) getBean(name);
    }

    protected  <T> T doGetBean(final String name,final Object[] args){
        Object bean = getSingleton(name);
        if (bean != null){
            return (T) bean;
        }
        BeanDefinition beanDefinition = getBeanDefinition(name);
        return (T) createBean(name, beanDefinition,args);
    }


    protected abstract BeanDefinition getBeanDefinition(String beanName) throws BeansException;

    protected abstract Object createBean(String beanName,BeanDefinition beanDefinition,Object[] args)throws BeansException;
}
